In this moment, he’s thinking of his classmate — and soon-to-be significant other — Rihito Sajou. The band moves around him, but he’s lost in his own world, as shown by isolating his moving fingers in a panel and later, his still body in a full frame. Paneling is used a few times in Doukyuusei, always to display heightened emotion or to draw attention to the feelings of a specific character. It reminded me of the currently-airing series Scum’s Wish, which uses paneling as its primary visual technique.